FLIGHT762
Member
O/P, you likely have a bad lot of cases that didn't get properly annealed at the factory. You can anneal the rest of the cases or get some new brass.
Well, that too I suppose.
But unlike pierced primers burning the same place every time.
The chance of a split case neck happening in the same place in the chamber twice is about 1 in 360 degrees.
I would chalk it up to bad brass and call it explained.
I have had new Federal 9mm brass come apart at the seams the first time it was reloaded.
View attachment 210180
rc
Believe what you want.That also says that extra hot loads can cause a brass case to get harder quicker
Believe what you want.
But, case neck work hardening / splitting is caused by expansion in the chamber.
And compression in the sizing die.
Time after time.
A case neck can only expand so far inside the chamber.
And it will do it exactly the same amount at 45,000, or 65,000 PSI.
A loose chamber and a tight sizing die will result in neck cracks faster then prolonged firing in a tight chamber and a minimum spec sizing die & expander working it harden every re-loading cycle.
Work hardened brass comes from repeated expansion and sizing / expanding.
(Just like bending a wire back and forth until it breaks.)
Not from pressure.
Cases fail from excess pressure first with case head expansion, and loose primer pockets.
Not from split necks.
Respectfully, I disagree. I see that as somewhat of a waste, it could be otherwise functional brass. Annealing can and in most cases will extend the safe life of brass if done properly.Trash the problem brass, don't worry about annealing case necks.......I don't think annealing is something that's worth the time to most seasoned reloaders much less a new reloader.
I agree.FC (Federal) brass is not great brass, if not for split neck you will probably loose it due to loose primer pockets.........and Federal makes some of the best factory ammo in my opinion.